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SubjectRe: [RFC PATCH v2 12/18] media: tegra-video: Add support for selection ioctl ops
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On 02/07/2020 23:20, Sowjanya Komatineni wrote:
>
> On 7/2/20 6:54 AM, Hans Verkuil wrote:
>> On 17/06/2020 03:41, Sowjanya Komatineni wrote:
>>> This patch adds selection v4l2 ioctl operations to allow configuring
>>> a selection rectangle in the sensor through the Tegra video device
>>> node.
>>>
>>> Some sensor drivers supporting crop uses try_crop rectangle from
>>> v4l2_subdev_pad_config during try format for computing binning.
>>>
>>> So with selection ops support, this patch also updates try format
>>> to use try crop rectangle either from subdev frame size enumeration
>>> or from subdev crop boundary.
>>>
>>> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
>>> ---
>>> drivers/staging/media/tegra-video/vi.c | 106 +++++++++++++++++++++++++++++++++
>>> 1 file changed, 106 insertions(+)
>>>
>>> diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
>>> index 506c263..f9eb96b 100644
>>> --- a/drivers/staging/media/tegra-video/vi.c
>>> +++ b/drivers/staging/media/tegra-video/vi.c
>>> @@ -427,6 +427,13 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
>>> struct v4l2_subdev *subdev;
>>> struct v4l2_subdev_format fmt;
>>> struct v4l2_subdev_pad_config *pad_cfg;
>>> + struct v4l2_subdev_frame_size_enum fse = {
>>> + .which = V4L2_SUBDEV_FORMAT_TRY,
>>> + };
>>> + struct v4l2_subdev_selection sdsel = {
>>> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>>> + .target = V4L2_SEL_TGT_CROP_BOUNDS,
>>> + };
>>> int ret;
>>>
>>> subdev = tegra_channel_get_remote_subdev(chan, true);
>>> @@ -449,6 +456,24 @@ static int __tegra_channel_try_format(struct tegra_vi_channel *chan,
>>> fmt.which = V4L2_SUBDEV_FORMAT_TRY;
>>> fmt.pad = 0;
>>> v4l2_fill_mbus_format(&fmt.format, pix, fmtinfo->code);
>>> +
>>> + /*
>>> + * Attempt to obtain the format size from subdev.
>>> + * If not available, try to get crop boundary from subdev.
>>> + */
>>> + fse.code = fmtinfo->code;
>>> + ret = v4l2_subdev_call(subdev, pad, enum_frame_size, pad_cfg, &fse);
>>> + if (ret) {
>>> + ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
>>> + if (ret)
>>> + return -EINVAL;
>>> + pad_cfg->try_crop.width = sdsel.r.width;
>>> + pad_cfg->try_crop.height = sdsel.r.height;
>>> + } else {
>>> + pad_cfg->try_crop.width = fse.max_width;
>>> + pad_cfg->try_crop.height = fse.max_height;
>>> + }
>>> +
>>> ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
>>> if (ret < 0)
>>> return ret;
>>> @@ -540,6 +565,85 @@ static int tegra_channel_set_subdev_active_fmt(struct tegra_vi_channel *chan)
>>> return 0;
>>> }
>>>
>>> +static int tegra_channel_g_selection(struct file *file, void *priv,
>>> + struct v4l2_selection *sel)
>>> +{
>>> + struct tegra_vi_channel *chan = video_drvdata(file);
>>> + struct v4l2_subdev *subdev;
>>> + struct v4l2_subdev_format fmt = {
>>> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>>> + };
>>> + struct v4l2_subdev_selection sdsel = {
>>> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>>> + .target = sel->target,
>>> + };
>>> + int ret;
>>> +
>>> + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
>>> + return -ENOTTY;
>>> +
>>> + if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>>> + return -EINVAL;
>>> + /*
>>> + * Try the get selection operation and fallback to get format if not
>>> + * implemented.
>>> + */
>>> + subdev = tegra_channel_get_remote_subdev(chan, true);
>>> + ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
>>> + if (!ret)
>>> + sel->r = sdsel.r;
>>> + if (ret != -ENOIOCTLCMD)
>>> + return ret;
>>> +
>>> + ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
>>> + if (ret < 0)
>>> + return ret;
>>> +
>>> + sel->r.left = 0;
>>> + sel->r.top = 0;
>>> + sel->r.width = fmt.format.width;
>>> + sel->r.height = fmt.format.height;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_channel_s_selection(struct file *file, void *fh,
>>> + struct v4l2_selection *sel)
>>> +{
>>> + struct tegra_vi_channel *chan = video_drvdata(file);
>>> + struct v4l2_subdev *subdev;
>>> + int ret;
>>> + struct v4l2_subdev_selection sdsel = {
>>> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
>>> + .target = sel->target,
>>> + .flags = sel->flags,
>>> + .r = sel->r,
>>> + };
>>> +
>> This function doesn't check if the subdev actually supports set_selection.
>> The imx219 is one such driver: it supports get_selection, but not set_selection.
>>
>> So this code should add these lines to fix the v4l2-compliance fail:
>>
>> subdev = tegra_channel_get_remote_subdev(chan, true);
>>
>> if (!v4l2_subdev_has_op(subdev, pad, set_selection))
>> return -ENOTTY;
>>
> v4l2_subdev_call() does that check and returns -ENOIOCTLCMD when
> specified subdev ops does not exist.

But that test happens too late. In the v4l2-compliance test it fails in the
sel->type test below, so it returns EINVAL instead of ENOTTY.

>>> + if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
>>> + return -ENOTTY;

I think this test should come before the v4l2_subdev_has_op test since there
is probably no subdev if the TPG is enabled. So:

if (IS_ENABLED(CONFIG_VIDEO_TEGRA_TPG))
return -ENOTTY;

subdev = tegra_channel_get_remote_subdev(chan, true);
if (!v4l2_subdev_has_op(subdev, pad, set_selection))
return -ENOTTY;


Regards,

Hans

>>> +
>>> + if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>>> + return -EINVAL;
>>> +
>>> + if (vb2_is_busy(&chan->queue))
>>> + return -EBUSY;
>>> +
>>> + subdev = tegra_channel_get_remote_subdev(chan, true);
>> And this line can be dropped.
>>
>> Regards,
>>
>> Hans
>>
>>> + ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
>>> + if (!ret) {
>>> + sel->r = sdsel.r;
>>> + /*
>>> + * Subdev active format resolution may have changed during
>>> + * set selection operation. So, update channel format to
>>> + * the sub-device active format.
>>> + */
>>> + return tegra_channel_set_subdev_active_fmt(chan);
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> static int tegra_channel_enum_input(struct file *file, void *fh,
>>> struct v4l2_input *inp)
>>> {
>>> @@ -597,6 +701,8 @@ static const struct v4l2_ioctl_ops tegra_channel_ioctl_ops = {
>>> .vidioc_streamoff = vb2_ioctl_streamoff,
>>> .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
>>> .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
>>> + .vidioc_g_selection = tegra_channel_g_selection,
>>> + .vidioc_s_selection = tegra_channel_s_selection,
>>> };
>>>
>>> /*
>>>

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